Help rooting Galaxy S5 Active? (SM-G870A)

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Feb 7, 2017, 2:08:12 AM via Website

Hello! I I'm new to rooting and don't exactly know much more than just the basics. I know that I have to use Odin to downgrade the software but I can't seem to make it work. Also, I dont really know what to do after that. I have a Samsung Galaxy S5 Active SM-G870A version 5.1.1
I'm using Odin 3.10.7 trying to Downgrade to 4.4.2 but am getting a message that says

Complete(Write) operation failed
All threads completed. (succeed 0 / failed 1)

Does anybody know what is causing this and how to fix it? Thank you in advance!